ID refs

Dear all,
 
I'm having trouble in making a particular operation with xsl
I have the following XML:
 
 
<Specification_expression id="specification_expression-1">
      <id>teste</id>
      <description>teste</description>
      <operation>or_operator</operation>
      <operand>
           <sos ref="sos-1"/>
      </operand>
 </Specification_expression>
  
 <sos id="sos-1">
  <Specification ref="specification-7"/>
 </sos>
 
 
and I'm trying to obtain the following:
 
 
<Specification_expression id="specification_expression-1">
       <id>teste</id>
       <description>teste</description>
       <operation>or_operator</operation>
       <operand>
            <sos>
                 <Specification ref="specification-7"/>
            </sos>
       </operand>
 </Specification_expression>
 
 
 
Thanks in advance, 
 
Ricardo Saraiva.




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